Casing head



G., H. JAQUE@ CAS I NG HEAD Filed Feb. l. 19271 Ii w,

tn-WMM T viii/Ila Patented Der. 27, 1927. .I y

UNITED-STATES GEORGE n. JAaUEs, or casrnn, WYOMING.'

y CASING HEAD.

Application led February 1, 1927. Serial No. 165,127.

vThe invention relates to a novel form of v casing head for oil vwellsand the like,pro' vided with aset of slips to land or support an insidestring ofcasing or tubing and a second set of slips to anchor the insidestring.

the packing may be applied, removed or ady justed without effecting therelation of the supporting and landing slips'and the inner string ofcasing or tubing, the particular coordination of the casing head and theslips preventing the accidental movement of the inner string of casingor tubing in either direction with respect to the casing to which thehead is applied'. The invention is illustrated in the accompanyingdrawings, in which U f Fig. 1 is a sectional elevation of the head asapplied to the outery casing and the inner 'casing or tubing.

Fig. 2 is a vertical sectional elevation of the supporting or landingslips.

l Fig. 8 is a plan view thereof.

Fig. 4 is a sectional elevation of the anchoring slips.

Fig. 5 is a plan view thereof.

Referring to the drawings, 1 indicates the main or body portion ofthetubular head, the lower end of which is provided with internal screwthreads 2 to engage the threadedend of the outer casing C. The interiorof the tubular body portion l is' provided with an intermediatedownwardly tapered bore 5 which constitutes a seat for the landing orsupporting slips and above the tapered bore is a cylindrical boresection 3 having an annular shoulder 4 at its bottom, which serves as aseat for the lower packing ring.

Removably engaging the downwardly tapering bore section 5 are thelsupporting orl anchoring slips 10, which are arcuate in cross sectionand have their inner faces provided with upwardly inclined teeth orserrations 11 and their outer peripheral faces beveled or inclined' toengage the inclined wall of the tapered bore section 5. As indicated inFig. 1, the serrated inner faces of the slips surround and engage theinner string. of casing or tubing T and .prevent any downward movementof the latter.

Mounted in the cylindrical upper bore section 3 is a suitable ackingcomprising overlapping compressi le gaskets 15 heldl between lower andupper split packing rings 16, 16, the` former of which restsupon the'annular shoulder 4.

Engaging the upper end of the cylindrical portion ofthe bore and thepacking therein are anchoring slips v`18, which are arcuate in crosssection and have their interior surfaces provided with a series ofannular downwardly extending teeth or serrations 19 and their outerperipheral faces provided with an upward taper, so that the slips, whenassembled, constitute a vertical split frustum of a cone, whichsurrounds the inner string of casing or tubing T, as indicated in Fig.1, with the lower end of the slip sections engaging the packing.

Secured in the upper end of the tubular member lis a series of studs orbolts-23 having adjustin nuts 24 on their outer ends, said bolts passingthrough. holes 22 in an anchoring ring 20, the inner periphery of whichring is provided withV a downwardly flaring or tapering surface 21cooperating with the upwardly tapering surfaces of the slips 18.

The various parts are assembled and adjusted as illustrated in Fig. 1;that is to say, the casi-ng head 1 is engaged with the upper end of theouter casing C and the p landing or supporting slips 10 are driven homein the tapered section 5 of the bore, so that the teeth or serrations onthe inner faces casing or tubing T and rigidly support the latteragainst downward movement. The packing is then applied in the uppercylindrical bore section 3, as shown, and the upper or anchoring slipsplaced in position above the packing, after which the anchor ring 20 isthreaded over the bolts 23. As the nuts 24 are set up on the bolts 23,the anchoring slipsi are. tapped down 'evenly with a hammer unt-il thepacking 15 is sufliciently compressed to produce a lfluid-tight jointbetween the casing head and the inner string of casing or tubing. Thisprecaution is necessary in order to prevent the anchoring slips fromgripping the inner string before the packing is suiciently compressed toeffect a tight joint.

As thus constructed and applied, it will be seen that the new casinghead not only serves to support the weight of the anchored string ofcasing or tubing within the outer casing and prevents the well pressurefrom raising the inner string, but inasmuch as of the slips bite intothe surface of the inner j and upwardly tapered peripheral outer thepacking is held-in position and properly compressed by the upperanchoring slips, it will be apparent that both the packing and the upperanchoring slips may be applied and adjusted Without moving or ,handlingthe inner string of casing or tubing, as the latter is supported in thecasing head 1 by means of the lower or landing slips 10;

-reapplied after the inner casing or tubing has been properly landed orpositioned. f

What I claim is; 1. A casing head comprising a tubular member adapted tobe secured to the well casing and provided with a downwardly taperingbore, arcuate slips having serrated inner faces and tapered outerperipheral U faces engaging the tapered bore, packing in ,thepbore abovethe'slips, arcuate anchoring slips above the packingl havingserratedfaces faces, an anchor ring having a; tapered opening vengaging theperipheral. faces of said anchoring slips, and means for adjustablyconnecting said ring to the upper end of the tubular member.

2. A casing-head comprising a tubular member adapted to be secured tothe well casing and provided with a downwardly tapering bore, arcuateslips havingserrated yinner faces and tapered outer peripheral facesengaging the tapered bore, packing inl the bore above the slips, arcuateanchoring slips above the packing vhaving serrated faces and ,upwardly`tapered peripheral Y outer faces, an anchor ring having a taperedopening engaging the peripheral faces of Y' said anchoring slips, andbolts engaging the.

upper end of the tubular member for adl justing the anchor ring.

3. A casing head comprising a tubular member adapted to be 'secured tothe up er end of a well casing and having a cylin rical upper boresection and a downwardly taperlng lower bore section, arcuate landingslips having serrated inner faces and' tapered outerperipheral facesengaging the tapered bore, packing in the cylindrical bore section,arcuate anchoring slips above the .packing having serrated inner 'facesand up- Wardly tapered peripheral outer faces, an

anchor ring 4having a tapered'opening engaging the peripheral faces ofsaid anchor- 111g slips, and means for adjustably connecting said ringto the upper end of the tubular member.

4. A casing heady comprising a tubular member 'adapted to be secured tothe upper end of a well casing andhaving^a cylindrical upperbore'section and a downwardly tapering lower bore section, arcuatelanding slips having serrated inner facesl and tapered outer peripheralfaces engaging the tapered bore, packing in the cylindrical boresection, arcuate anchoringslips above `the packing having serratedVinner faces and upwardly tapered peripheral outer faces, an anchor ringhaving a tapered opening engaging the/peripheral faces of' saidanchoring slips, and bolts engaging the upper end of the tubular memberfor adjusting the anchor ring.

In testimony whereof I affix my signature.

j GEORGE I-I. JAQUES

